public class demo9 {
    public static void main(String[] args) {
        Thread t = new Thread(new Thread(){
            @Override
            public void run() {
                System.out.println("正在执行 run ");

                try {
                    sleep(1000);
                } catch (Exception e) {
                    throw new RuntimeException(e);
                }
            }
        });
    }


}
